add header

diff --git a/tests/examples/step-56.cc b/tests/examples/step-56.cc
index 149379bce529aae926ac578e052a99160c99d706..12ede54112c7543058cde3a04fb53d6eee77dd75 100644 (file)
--- a/tests/examples/step-56.cc
+++ b/tests/examples/step-56.cc
@@ -72,6 +72,8 @@
 #include <fstream>
 #include <iostream>
 
+#include "../tests.h"
+
 namespace Step56
 {
   using namespace dealii;